Egg? Concretion?

[Jerkie]

Found this rock on the nueces river. Texas hill country.

 

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[Jerkie]

Here are a couple more pictures

 

[kingskid1611]

Neat rock. almost looks like an egg. someone may be able to help.

 

[Lygore]

Could be a septarian nodule.

 

[smokeythecat]

Cool rock. You can prank anyone and call it a dinosaur egg. I can't tell by the pictures.

 

[A2coins]

That would be a really cool find if it was an egg and if you could determine who's in there lol